12 month business visa

I am a loyal customer for your services.
I have been getting 3 month multiple, tourist visas.
If i come back as I have been doing in the next couple of years, I will use up all of my available passport pages on Vietnam visas alone.
This does not work well as I travel to about a dozen asian countries for my business.
I would like to get a 12 month business visa, multiple entry next time I renew.
My current visa expires 17 June.
Please advise specifically CAN you do this.
What will it cost?
Thank you.